function dataFormat(dtStr) {
  const dt = new Date(dtStr);

  const y = dt.getFullYear();
  const m = padZero(dt.getMonth());
  const d = padZero(dt.getDate());

  const hh = padZero(dt.getHours());
  const mm = padZero(dt.getMinutes());
  const ss = padZero(dt.getSeconds());

  return `${y}-${m}-${d} ${hh}:${mm}:${ss}`;
}

function padZero(n) {
  return n > 9 ? n : '0' + n;
}

module.exports = {
  dataFormat,
};
